Following the death of Ivan the Terrible, Boris Godunov becomes regent for the feeble-minded Tsar Fyodor, after the original heir to the throne, the boy-prince Dimitri, dies mysteriously. It is widely rumored that mad Boris murdered the boy, and when a renegade monk later appears claiming to be Dimitri, he rapidly becomes a focus for revolt. Also includes: Mozart and Salieri and A Stone Guest.